单项选择题

Last week I wrote to the hotel to book a room, but they （） yet.

A．didn’t answer
B．wasn’t answering
C．hadn’t answered
D．haven’t answered

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单项选择题
（）by a large audience, he felt very nervous and didn’t know what to say.

A．Watching
B．Watch
C．Watched
D．Having watched
单项选择题
I’m very grateful for your help and hope to do something for you（）in the future.

A.in exchange
B.instead
C.in return
D.in particular
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